Malicious PDF — malware analysis report

Static analysis result for SHA-256 f173110e6784ec59…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 17:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c19595df9b9bbe5f7d9bc3141ba939bb SHA-1: af6285f213e487c2da7f2323412f246fffcf250d SHA-256: f173110e6784ec595866ddbae90022898ea04a6974da56004231c747bd106fdb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts with few links per host, suggesting an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the presence of many suspicious URLs points towards a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tscyw.net/userfiles/file/20210915202215_pvsxkn.pdf In PDF document text
    • http://jnnycc.org/userfiles/file/83239444697.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/wefak.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/wijekovifijeravovukiwiki.pdfIn PDF document text
    • http://takitech.hu/userfiles/file/98848146985.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/poxamanepuzafusek.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/levidoxologibasepomika.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/larigidevenunizojefubagaj.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/93856709290.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/vuvusawevesot.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48082324234.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/23993933622.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/30624934299.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/12382414188.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/55389111719.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/fadujewenunijelazi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/87744510483.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/gokiwimunixes.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a2bf4c3f00c952f0e3a56927c1a4fe0c/45455345845.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fugalumoparetorezugobabe.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/96551013214.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202195257359264.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63325106928.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dekukokafox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=level+8+cannon+clash+of+clansPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE9 16496 bytes
SHA-256: c644c22c6c9cae241a78a0992e5cfb84c767d7d29d9134d161f644091b9d662e
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10376 bytes
SHA-256: 9c9562841125d2da43ab17f3f9508adda48a9bf9edcbb0137924df1575384d29

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